@infinityprep1234 I think you are conflating some ideas, specifically, how many people take APs/post-APs across multiple subjects vs for how many the GCs check the most rigorous check box.
For both questions, no, I do not know. Specific to Andover, they do not offer APs in history (although they do offer in other social sciences) or English (although English 300 and History 300, which all students take (or a similar version for some first-year intl students), is certainly at AP level). Regardless, many students do take AP exams in those areas. I would say that taking all 3 core science APs (bio (which is not officially AP at Andover)/chem/physics C) is rare - 2 is more common, but far from universal. I would say that at many schools, the offerings, even if not officially called AP, are at that level or beyond. So, it would not be uncommon for STEM kids to have AP-level humanities courses and vice versa.
As far as the percentage of students are rated as having the “most rigorous” schedule, I imagine it varies by school, but the ratings probably follow some type of bell curve, so 10-15% would be my guess.